Buying Coins and Stamps by Mail Order: Grading, Authentication, and Buyer Protections
Coins and stamps have been sold by mail longer than almost any other category, but grading disputes and counterfeits sink more of these transactions than shipping problems ever do.
Coin and stamp dealers were running mail-order businesses before most other retail categories existed, and the model still works well for collectors who cannot get to a coin show or a specialty shop. What makes this category different from furniture or clothing is that the value of the item is tied directly to its condition and authenticity, both of which are hard to judge from a photograph. A coin that looks fine in a listing photo can have a hairline scratch, a cleaning mark, or a re-toned surface that only shows up under raking light in hand.
Raw versus slabbed: know what you are buying
A "raw" coin or stamp is one that has not been independently graded, meaning the seller's stated grade is an opinion, not a certification. A "slabbed" item has been sent to a third-party grading service, encapsulated in a tamper-evident holder, and assigned a numeric grade along with a certification number you can look up. For any purchase over roughly $150, buying slabbed material from a recognized service removes most of the grading risk, because the grade is no longer the seller's word against yours.
| Grading service | Category | What it verifies |
|---|---|---|
| PCGS | Coins | Authenticity, grade, and detects cleaning or damage |
| NGC | Coins | Authenticity, grade, and strike designations |
| PSE (PSAG) | Stamps | Centering grade and soundness (faults, thins, regumming) |
| APEX (American Philatelic Society) | Stamps | Genuineness and identifies alterations or reperforation |
Every legitimate grading service publishes a certification lookup on its own website. Before paying, take the certification number from the listing photos and check it directly on the grading service's site rather than trusting a screenshot, since screenshots of certificates can be edited or reused from a different, similar item.
Common red flags in listings
- Photos that are blurry or oddly lit specifically over the areas where damage or wear would show, such as the high points of a coin's design or the perforations on a stamp.
- Grades described in vague terms like "museum quality" or "investment grade" instead of an actual numeric or letter grade from a named service.
- Prices well under the going rate for a genuine item in that grade — if a coin sells for a fraction of published price guide values, assume it is either misgraded, damaged, or a reproduction until proven otherwise.
- Sellers who refuse a hold period or inspection window before payment clears, which is a common tactic to prevent buyers from consulting a third party before the sale is final.
Modern counterfeit coins, particularly reproductions of older US and world coins, have become sophisticated enough that even the correct weight and diameter no longer rule out a fake. Metal composition, edge lettering, and die characteristics are what separates a genuine strike from a well-made copy, and these are exactly the details a slab from a major grading service confirms.
Payment and dispute protections
Pay by credit card whenever the seller allows it, even if there is a small processing surcharge, because card issuers offer chargeback rights that wire transfers and money orders do not. Reputable coin and stamp dealers who belong to trade organizations such as the American Numismatic Association or the American Philatelic Society typically post a return policy that explicitly allows returns if an item does not match its stated grade upon independent verification. Get that policy in writing, ideally in the same email thread as the purchase, before sending payment for anything of significant value.
If a purchase turns out to be counterfeit, in addition to disputing the charge with your card issuer, report it to the grading service if a fake certification number was involved, since these services actively track counterfeit slabs and cooperate with law enforcement on mail fraud cases. The US Postal Inspection Service also investigates fraud conducted through the mail, and a formal complaint creates a record even if it does not resolve your individual case quickly.
For lower-value material bought mainly for enjoyment rather than investment, some of this rigor is unnecessary. A $20 stamp lot for a beginning collector does not need third-party grading. But once a single item's price crosses into the hundreds of dollars, the cost of certification or verification is small compared to the risk of paying full price for a coin or stamp that will not resell for anywhere near what you paid.